| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MEDIA_AUDIO_WIN_AUDIO_DEVICE_LISTENER_WIN_H_ |
| #define MEDIA_AUDIO_WIN_AUDIO_DEVICE_LISTENER_WIN_H_ |
| |
| #include <MMDeviceAPI.h> |
| #include <wrl/client.h> |
| |
| #include <memory> |
| #include <string> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "base/threading/thread_checker.h" |
| #include "base/time/time.h" |
| #include "media/base/media_export.h" |
| |
| namespace base { |
| class TickClock; |
| } |
| |
| namespace media { |
| |
| // IMMNotificationClient implementation for listening for default device changes |
| // and forwarding to AudioManagerWin so it can notify downstream clients. Only |
| // output (eRender) device changes are supported currently. Core Audio support |
| // is required to construct this object. Must be constructed and destructed on |
| // a single COM initialized thread. |
| // TODO(dalecurtis, henrika): Support input device changes. |
| class MEDIA_EXPORT AudioDeviceListenerWin : public IMMNotificationClient { |
| public: |
| // The listener callback will be called from a system level multimedia thread, |
| // thus the callee must be thread safe. |listener| is a permanent callback |
| // and must outlive AudioDeviceListenerWin. |
| explicit AudioDeviceListenerWin(const base::Closure& listener_cb); |
| virtual ~AudioDeviceListenerWin(); |
| |
| private: |
| friend class AudioDeviceListenerWinTest; |
| |
| // Minimum allowed time between device change notifications. |
| static const int kDeviceChangeLimitMs = 250; |
| |
| // IMMNotificationClient implementation. |
| STDMETHOD_(ULONG, AddRef)() override; |
| STDMETHOD_(ULONG, Release)() override; |
| STDMETHOD(QueryInterface)(REFIID iid, void** object) override; |
| STDMETHOD(OnPropertyValueChanged)(LPCWSTR device_id, |
| const PROPERTYKEY key) override; |
| STDMETHOD(OnDeviceAdded)(LPCWSTR device_id) override; |
| STDMETHOD(OnDeviceRemoved)(LPCWSTR device_id) override; |
| STDMETHOD(OnDeviceStateChanged)(LPCWSTR device_id, DWORD new_state) override; |
| STDMETHOD(OnDefaultDeviceChanged)(EDataFlow flow, |
| ERole role, |
| LPCWSTR new_default_device_id) override; |
| |
| base::Closure listener_cb_; |
| Microsoft::WRL::ComPtr<IMMDeviceEnumerator> device_enumerator_; |
| |
| // Used to rate limit device change events. |
| base::TimeTicks last_device_change_time_; |
| |
| // AudioDeviceListenerWin must be constructed and destructed on one thread. |
| base::ThreadChecker thread_checker_; |
| |
| const base::TickClock* tick_clock_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioDeviceListenerWin); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_AUDIO_WIN_AUDIO_DEVICE_LISTENER_WIN_H_ |